Wrench



1.8.. McKIBBON.

WRENCH.

APPLICATION FILED FEB. 9, 1922.

Patented July 18, 1922.

time

JOE S. lvIoKIBBQN, 0F LUS ANGELES, CALIFORNIA.

"WRENCH.

Application filed February T 0 (ZZZ 101 1077 it may concern Be it known that I, don hi -slimmer, a citizen of the United States, resic ing Los Angeles in the county of Los Angeles and State of California, have invented new and useful Improvements in l i renches, oi .vhich the following is a specification.

My invention relates to wrenches, and a purpose of my invention is the provision of a wrenchhaving a stationary jaw and a movable jaw associatedwith the stationary jaw to occupy advanced and retracted positions and adapted to automatically occupy an advanced position when operating a nut whereby the two jaws are caused to securely grip the nut and positively prevent the slipping oi the wrench upon the nut and the conse quent injury of the operators hands.

Although I will describe only one form or": wrench embodying my invention and point out the novel features thereof in claims, it is to he understood that various changes and modifications may he made herein without departing from the spirit and scope of such claims.

In the accompanying drawings,

Figure 1 is a view showing in side elevation and partly in section one form of wrench embodying my invention.

Fig. 2 is a View similar to Fig. 1 the handle broken away.

F 3 is a detail perspective view with the connecting link comprised in the wrench shown in. the preceding views.

Fig. 4t is a detailperspective view of the connecting stud comprised in the wrench shown in the preceding views.

ltcjlerring specifically to the drawings in which similar reference characters refer to similar parts, my invention, inits present embodiment, comprises a stationary jaw J and a movable jaw J, the two jaws being provided on the confronting faces with rearwardly extending serrations 15, and integrally formed shanks 16 and 17, respectively, with the shank 16 being extended to provide an operating handle or bar 18. At corresponding points adjacent the jaws J and J, the shanks 16 and 17 are formed with openings 16 and 17 respectively, in which is loosely received a connecting stud S. As clearly shown in Fig. 1, the connecting stud is formed at its lower end with an annular shoulder 19 adapted to loosely seat within the correspondingly shaped enlargement 20 of the opening 16. The upper end of the with fs'pecification of Letters Patent.

Patented July 18, 9, 1922; Serial no. 535,210.

stud extends into the opening 17 and is provided with a screw-threadcd bore 21 in which is received an adjusting screw K having a knurled head of sufiicient size to prevent the passage of the screw downwardly through the opening 17 The shanks 16 and 17 are notched opposite edges as indicated at 22 and 23, respectively, and these notches receive pins 2 1- and 25 constituting a portion of a connecting link designated generally at L and including ovate plates 26 rigidly connector to each other by the pins 24: and 25.

From the foregoing arrangement it will be clear that the connecting link L provides means for movably associating the jaw J with respect to the jaw J and in such n'ianner as to allow oi the jaw J occupying a re tr'acted or projected position as shown in Fig. 1 or an advanced position as shown in Fig. 2, it being understood that the loose litting of the stud within the openings 16 and 17 allows of the necessary movement of the jaw J to occupy these two positions.

The screw K co-operates with the connecting stud S in providing adjusting means for the jaw with respect to the jaw J to allow of the wrench being accommodated to" nuts of different sizes. To nor-- mally maintain the jaws in expanded position and thereby eiiect the proper 03eration of the screw K, a leaf spring D is secured to the inner edge of the shank 16 by means of a rivet27, and this spring is bent longitudinally so that its :tre e end bears against the shank 17 at a point adjacent the opening 17 thereby urging the jaw J outwardly so that its shank engages the head of the screw K.

In operation, the wrench is first adjusted by a mani nilation of the screw K to space apart the jaws J and J to the required distance whereiiipon the wrench is applied in the usual manner. It the jaw J is in the projected position as shown in Fig. 2 when the wrench is applied to the nut, the triotional contact or the jaw with the nut will move the jaw rearwardly to the retracted position shown in Fig. 1. Consequently whenlateral pull is exerted on the bar 18 in effecting rotation of the nut, the serrations 15 of the jaw J grip the nut and thereby cause the jaw J to move to the projected position shown in Fig. 2. Vvith jaw J in this position, itwill be clear that it eliectively co-operates with the jaw J in posititively presenting disengagement or movement of the jaws with respect to the nut so that the possibility of the wrench slipping from the nut is prevented.

It will be manifest that the secure gripping of the jaws is obtained by virtue of the fact that when the jaw J is in projected position its serrated surface is in parallelism with the serrated surface of the jaw J so that the two surfaces grip the faces of the nut with pressure which is uniform throughout the length of such surfaces.

What I claim is:

1. A wrench comprising a stationary aw, a movable jaw associated vith the stationary jaw to occupy a retracted position in which the faces of the jaws are disposed in converging relation to each other, and a projected position in which said faces are disposed in spaced parallelism, means for automatically opening the jaws, and adjustable means for limiting the opening action.

2. A wrench comprising a stationary jaw, a movable jaw associated with the stationary jaw to occupy a retracted position in which the faces of the jaws are disposed in converging relation to each other, and a projected position in which said faces are disposed in spaced parallelism, and loose coupling means for adjusting the movable jaw with respect to the stationary jaw irrespective of the position of the former, and passing through the jaws.

3. A wrench comprising stationary and movable jaws, shanks formed on the jaws, a connecting link associated with said shanks to allow the movable jaw to occupy retracted and projected positions with respect to the stationary jaw, and means passing through and for adjusting said jaws with relation to each other.

l. A wrench comprising stationary and movable jaws, shanks formed on the jaws, a connecting link associated with said shanks to allow the movable jaw to occupy retracted and projected positions with respect to the stationary jaw, a connecting stud loosely sustained in the shank of the stationary jaw, a screw threadedly engaging the stud and loosely fitted. within the shank of the movable jaw, and a spring interposed between the shanks for urging the movable jaw outwardly with respect to the stationary aw.

5. A wrench comprising stationary and movable jaws, shanks for the jaws having recesses formed therein and a connecting link including plates and pins connecting the plates, said pins being rockably mounted in said recesses, a connecting stud loosely sustained in the shank of the stationary jaw, a screw threadedly engaging the stud and loosely fitted within the shank of the movable jaw, and a spring interposed between the shanks for urging the movable jaw outwardly with respect to the stationary jaw.

(LA wrench comprising a pair of 0pposed jaws having extended shanks, means pivotally connecting the extended shanks to permit one of the jaws to shift longitudinally as to the other jaw and forming a sliding connection, and a coupling device passing through the jaws and providing for the said longitudinal relative movement and forming means for limiting separation of the swinging ends of the jaws.

7. A wrench comprising a pair of opposed jaws having eXtended shanks, means pivotally connecting the extended shanks to permit one of the jaws to shift longitudinally as to the other jaw and forming a sliding connection, a coupling device passing through the jaws and providing for the said longitudinal relative movement and forming means for limiting separation of the swinging ends of the jaws, and means for automatically spreading the jaws.

In testimony whereof I have signed my name to the specification.

J. S. MoKlBBON. 

